CN107314248B - Natural gas point supply odorization compensation monitoring device - Google Patents
Natural gas point supply odorization compensation monitoring device Download PDFInfo
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- CN107314248B CN107314248B CN201710630703.6A CN201710630703A CN107314248B CN 107314248 B CN107314248 B CN 107314248B CN 201710630703 A CN201710630703 A CN 201710630703A CN 107314248 B CN107314248 B CN 107314248B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
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Abstract
Natural gas point supplies to add smelly compensation monitoring device belongs to coal and changes gas engineering LNG point and supplies small gas flow and add smelly device technical field, especially relates to a natural gas point supplies to add smelly compensation monitoring device. The invention aims at the problems and provides a continuous, accurate and safe natural gas point supply odorization compensation monitoring device for odorization. The invention comprises a CPU, an EEPROM, an RS485 part, a power supply conversion part, a USB interface part, a clock circuit, a detection signal pulse input part, a one-way valve drive control part, an odorizing pump drive control part, a key part and a liquid crystal display screen, wherein a signal transmission port of the CPU is respectively connected with a signal transmission port of the EEPROM, a signal transmission port of the RS485 part, a signal transmission port of the USB interface part and a signal transmission port of the clock circuit, and a detection signal input port of the CPU is connected with a detection signal output port of the detection signal pulse input part.
Description
Technical Field
The invention belongs to the technical field of LNG point supply tiny gas flow odorization devices in coal-to-gas engineering, and particularly relates to a natural gas point supply odorization compensation monitoring device.
Background
The natural gas clean energy is used for replacing a coal-fired engineering project, and the method is a basic national policy of the government of China for reducing carbon dioxide emission, improving atmospheric quality, protecting ecological environment and improving the quality of life of people, and improves the coal-fired life style of vast rural areas into a gas-fired life style. As a benefit to the people engineering and the blue sky environmental protection engineering of government, LNG point supplies the apparatus and is all for the low-cost high-performance safe and reliable outfit requirement.
The natural gas is environment-friendly and convenient after being used as clean energy, but the natural gas is inflammable and explosive gas, once leakage occurs, fire or explosion accidents are likely to be caused, and enough safety guarantee measures must be provided for using the natural gas. The gas odorizing agent is added into the colorless and tasteless natural gas, so that the gas has enough special smell which is easy to identify, and the gas odorizing agent is one of the safety gas supply measures which are generally applied in the world at present.
The gas odorizing agent has special smell, has strong pungent smell at a very small concentration, is not easy to disappear, and is a good gas smell warning agent.
The gas odorizing agent is a chemical, most of which are toxic liquids, and the gas is flammable and explosive, and has certain danger and hazard as the gas. Most of gas odorizing agents are stable in chemical properties, difficult to naturally decompose and difficult to combine with other substances, and are substances with great harmfulness and potential safety hazards. In addition, the odorizing agent also has strong adsorption and desorption properties, the adsorption and desorption speeds are greatly different due to different materials, and once the odorizing agent leaks, the odorizing agent can easily adsorb other objects and emit odor of the odorizing agent for a long time.
When the amount of the odorant added to the gas is insufficient, a safety warning effect cannot be achieved, and when the amount of the odorant added to the gas is too large, incomplete combustion is caused, and other gas supply accidents which are not suitable are caused. GB50028 Town gas design Specification 3.2.3 clearly stipulates that when nontoxic gas leaks into air and reaches the concentration of 20% of the lower explosion limit, odor of the odorizing agent can be smelled, the odor intensity of the odorizing agent is 2-grade warning intensity, and taking tetrahydrothiophene odorizing agent as an example, 20mg of odorizing amount of unit gas should be added.
The gas odorizing device has the function of adding the odorizing agent into the gas, so that the gas in a gas pipeline has unique characteristic smell, and when the gas is just leaked, the gas is not damaged to people and is unlikely to explode, the gas can be easily detected by people, the leakage is timely treated, the alarm or escape is realized, the poisoning and explosion accidents caused by gas leakage are effectively avoided, and the safe gas supply is ensured.
Because the content of the odorizing agent needed in the fuel gas is very small and is in milligram level, the fuel gas flow is large enough (500 m) for the existing fuel gas odorizing device 3 Over h), the accumulated required odorizing dose is over 500 x 20=10000mg, the required odorizing dose per minute is over 10000 ÷ 60=166.67mg, calculated according to single output of 150mg-50mg, the odorizing pump basically ensures that each minute is dividedThe clock can have the output frequency of 1-3 times, basically ensures no odorizing agent back leakage phenomenon, and easily realizes uniform odorizing agent concentration and basically accurate addition.
When the gas flow is very small, less than 500m 3 In the hour/hour, the existing gas odorizing device cannot meet the requirement of accurate odorizing, an excessive odorizing method is usually adopted for processing, and the odorizing is not continuous when the odorizing amount is insufficient and the gas flow is low under certain conditions, so that the potential safety hazard of gas supply is generated.
The working principle of the existing gas odorizing device is as follows: the odorizing controller receives the analog current flow signal of the gas flowmeter and controls the odorizing pump to output odorizing agent according to the set odorizing amount. The odorizing pump converts continuous gas flow signals into reciprocating motion times of the plunger piston, is a discontinuous output process, and tends to continuously flow and inject into a gas pipeline through the transmission of an odorizing pipeline. The output of odorizing pump sets up the check valve, control odorizing agent liquid one-way flow, theoretically the check valve should not have any back leak volume, in fact receive the machining precision, the influence of dust in the pipeline and particulate impurity in the odorizing agent, the check valve has back leak volume, the back leak volume of check valve is very little when high frequency motion, hardly show, in case when the check valve low frequency motion, back leak volume that back leak volume can be accumulated along with time length can become bigger and bigger, too low motion frequency inevitably leads to the check valve stop motion time long, back leak volume probably exceeds the output volume. The pressure maintaining time of the one-way valve of the existing odorizing pump is about 30 minutes to 90 minutes, the working frequency is 50 times/time, the stable minimum single output is 50mg, and the minimum single output is 20mg/m according to the national standard 3 The odorization standard of (2.5 m) 3 And (5) odorizing the natural gas. When the gas flow is 500m 3 At the time of/h, the working frequency is 3.33 times, if the gas flow is as low as 50m 3 At/h, the operating frequency was only 0.333 strokes per minute, i.e. 3 minute movements. If the gas flow is as low as 5m 3 At/h, the gas recirculation phenomenon can occur only when the working frequency is only 0.0333 times/minute per minute, namely 30 minutes of action, namely, the gas recirculation phenomenon is a critical point if the gas flow is lower than 5m for a long time 3 Per hour, gas recirculation will occur.
In addition toWhen the odorous equipment actually runs, the gas flow can constantly change, the LNG point supply station only uses dozens of gas in 1 day under some circumstances, the gas is concentrated to use when three meals in the morning, noon and evening in many circumstances, the gas flow is very little in other times, and even several hours have 1m 3 The gas flow passes through, the gas flowmeter can only output an analog current signal of about 3.96 mA-4.04 mA under the condition, the zero drift phenomenon basically belongs to, the conventional controller can not output an accurate and effective odorizing pump action signal after receiving the signal value, the odorizing pump has long stop operation time which can reach 10-12 hours at most, and odorizing agent is not added into the gas flowing under the operation condition.
On the other hand, the back leakage amount of the one-way valve which does not move for a long time in the odorizing equipment is obvious, the odorizing agent left in the pipeline of the odorizing equipment can be pushed back to a part by the fuel gas, and also can be pushed back to the odorizing pump, and is most seriously pushed back to the odorizing agent storage tank, and the mixed gas of the fuel gas and the odorizing agent is discharged from the pressure relief opening of the storage tank. When the odorizing device moves again and outputs, the odorizing pump is completely filled with gas, no liquid odorizing agent exists, and the odorizing pump cannot output odorizing agent even if the operating frequency is high.
Disclosure of Invention
The invention aims at the problems and provides a continuous, accurate and safe natural gas point supply odorization compensation monitoring device for odorization.
In order to achieve the purpose, the invention adopts the following technical scheme that the invention comprises a CPU, an EEPROM, an RS485 part, a power supply conversion part, a USB interface part, a clock circuit, a detection signal pulse input part, a one-way valve drive control part, an odorizing pump drive control part, a key part and a liquid crystal display screen, wherein a signal transmission port of the CPU is respectively connected with a signal transmission port of the EEPROM, a signal transmission port of the RS485 part, a signal transmission port of the USB interface part and a signal transmission port of the clock circuit;
the CPU operation parameter setting input port is connected with the key part;
the control signal output port of the CPU is respectively connected with the control signal input port of the one-way valve drive control part and the control signal input port of the odorizing pump drive control part, the control signal output port of the one-way valve drive control part is respectively connected with the control signal input port of the lower one-way valve and the control signal input port of the upper one-way valve, and the control signal output port of the odorizing pump drive control part is connected with the control signal input port of the odorizing pump;
the power supply port of the CPU is connected with the power supply output port of the power supply conversion part.
As a preferable scheme, the CPU adopts an STC12C5A60S2 chip U1.
As another preferred scheme, the detection signal pulse input part adopts a TPL521 opto-coupler U2, wherein a pin 1 of the U2 is connected with a 24V power supply, a pin 2 of the U2 is connected with a detection signal pulse output port of a gas flowmeter through a resistor R6, a pin 3 of the U2 is grounded, and a pin 4 of the U2 is connected with a pin 12 of the U1.
As another preferred scheme, the driving control part of the odorizing pump adopts a TPL521 optical coupler U3, a pin 1 of the U3 is connected with a 5V power supply, a pin 2 of the U3 is connected with a pin 34 of the U1 through a resistor R7, and pins 4 and 3 of the U3 are connected with a control signal input port of the odorizing pump.
As another preferred scheme, the check valve drive control part of the present invention includes a TPL521 optocoupler U7 and a TPL521 optocoupler U13, pin 1 of U7 is connected to a 3.3V power supply through a resistor R40, pin 2 of U7 is connected to one end of a resistor R41, one end of a capacitor C35, and pin 21 of U1, the other end of the capacitor C35 is grounded, the other end of the resistor R41 is connected to pin 3 of U7, one end of a resistor R43, and one end of a resistor R42, respectively, pin 4 of U7 is connected to a P-12V end, the other end of the resistor R43 is connected to an NPN terminal at one end of a capacitor C39 and a base of a triode Q2, the other end of the capacitor C39 is connected to the other end of the resistor R42, an emitter of the triode Q2, and a ground wire, a collector of the NPN triode Q2 is connected to one end of the resistor R44 and a control signal input port of a lower one-way valve, and the other end of the resistor R44 is connected to a P-12V end through an LED lamp D9;
the pin 1 of the U13 is connected with a 3.3V power supply through a resistor R74, the pin 2 of the U13 is respectively connected with one end of a resistor R77, one end of a capacitor C79 and the pin 22 of the U1, the other end of the capacitor C79 is grounded, the other end of the resistor R77 is respectively connected with the pin 3 of the U13, one end of a resistor R83 and one end of a resistor R80, the pin 4 of the U13 is connected with a P-12V end, the other end of the resistor R83 is respectively connected with one end of a capacitor C81 and a base electrode of an NPN triode Q3, the other end of the capacitor C81 is respectively connected with the other end of the resistor R80, an emitting electrode of the NPN triode Q3 and a ground wire, a collector electrode of the NPN triode Q3 is respectively connected with one end of the resistor R86 and a control signal input port of the upper one-way valve, and the other end of the resistor R86 is connected with the P-12V end through an LED lamp 15.
As another preferred scheme, the EEPROM of the present invention includes a 24C02 chip, pins 1, 2, 3, and 4 of the 24C02 chip are grounded, pin 5 of the 24C02 chip is connected to one end of a resistor R2 and a CPU signal transmission port, pin 6 of the 24C02 chip is connected to a 3.3V power supply through a resistor R1, the other end of the resistor R2 is connected to the 3.3V power supply, pin 8 of the 24C02 chip, and one end of a capacitor C1, and the other end of the capacitor C1 is grounded.
As another preferred scheme, the RS485 part of the present invention includes a MAX485E chip U5, where pin 1 of U5 is connected to pin 10 of U1, pin 2 of U5 is connected to pin 3 of U5 and pin 14 of U1, pin 4 of U5 is connected to pin 11 of U1, pin 5 of U5 is grounded, pin 6 of U5 is connected to one end of a resistor R14 and an port a of a transmission interface J7, the other end of the resistor R14 is connected to port B of the transmission interface J7 and pin 7 of U5, and pin 8 of U5 is connected to a 5V power supply.
As another preferred scheme, the power conversion part of the invention comprises an LM2596 chip U9 and an LM1117 chip U10, wherein pin 1 of U9 is connected to the cathode of a diode D12, the power supply end of 12V, the anode of a capacitor C44, and one end of a capacitor C46, the anode of the diode D12 is connected to the output end of a switching power supply, and the input end of the switching power supply is connected to the commercial power; the negative electrode of a capacitor C44, the other end of the capacitor C46, the pin 5 of the U9 and the pin 3 of the U9 are grounded, the pin 2 of the U9 is respectively connected with the cathode of a Schottky diode D13 and one end of an inductor L5, the anode of the Schottky diode D13 is grounded, the other end of the inductor L5 is respectively connected with the positive electrode of a capacitor C50, the pin 4 of the U9, a power supply end of 5V, one end of a capacitor C52 and the pin 3 of the U10, and the negative electrode of the capacitor C50, the other end of the capacitor C52 and the pin 1 of the U10 are grounded; u10's 2 feet link to each other with electric capacity C53 one end, inductance L6 one end respectively, and the electric capacity C53 other end ground connection, and the inductance L6 other end links to each other with 3.3V power end, electric capacity C55 one end, resistance R46 one end respectively, and the electric capacity C55 other end ground connection, and the resistance R46 other end passes through LED lamp D14 ground connection.
As another preferred solution, the USB interface portion of the present invention includes a HEADER 14X2USB chip, wherein pin 2 of the USB chip is connected to a 3V3 power supply through a 0.47 μ F capacitor, pin 5 of the USB chip is connected to pin 3 of U1, pin 6 of the USB chip is connected to pin 4 and pin 3V3 power supplies of U1, pin 9 of the USB chip is connected to one end of a 10nF capacitor and pin 11 of the USB chip, and the other end of the 10nF capacitor is grounded; the 13 feet of USB chip link to each other with 12M crystal oscillator one end, first 22pF electric capacity one end respectively, and first 22pF electric capacity other end ground connection, the 12M crystal oscillator other end links to each other with the 14 feet of second 22pF electric capacity one end, USB chip respectively, and second 22pF electric capacity other end ground connection, 24 feet of USB chip loop through reverse emitting diode, 1K resistance connects 3V3 power.
As another preferable scheme, the clock circuit of the present invention includes 1302 a chip U4, where pins 2 and 3 of U4 are connected to two ends of a 32K768 crystal oscillator, pin 5 of U4 is connected to one end of a resistor R12 and pin 38 of U1, respectively, the other end of the resistor R12 is connected to a 5V power supply, pin 6 of U4 is connected to one end of a resistor R11 and pin 37 of U1, the other end of the resistor R11 is connected to the 5V power supply, pin 7 of U4 is connected to one end of a resistor R10 and pin 36 of U1, respectively, and the other end of the resistor R10 is connected to the 5V power supply; the 8 pins of U4 are connected with the battery.
As another preferred scheme, the key part of the present invention includes a KEYLEFT key, a KEYUP key, a KEYDOWN key, a KEYSET key, a KEYRIGHT key and a KEYCHANGE key, wherein one connection point of the KEYLEFT key is respectively connected to one end of the resistor R2 and the pin 2 of the U1, and the other connection point of the KEYLEFT key is grounded;
one connection point of the KEYUP button is respectively connected with one end of the resistor R3 and the 5 feet of the U1, and the other connection point of the KEYUP button is grounded;
one connection point of the KEYDOWN key is respectively connected with one end of the resistor R4 and the 7 pins of the U1, and the other connection point of the KEYDOWN key is grounded;
one connection point of the KEYSET key is respectively connected with one end of the resistor R5 and the pin 6 of the U1, and the other connection point of the KEYSET key is grounded;
one connection point of the KEYRIGHT key is respectively connected with one end of the resistor R1 and the pin 8 of the U1, and the other connection point of the KEYRIGHT key is grounded;
one connection point of the KEYCHANGE key is respectively connected with one end of the resistor R2 and the pin 1 of the U1, and the other connection point of the KEYCHANGE key is grounded;
the other end of the resistor R2, the other end of the resistor R3, the other end of the resistor R4, the other end of the resistor R5, the other end of the resistor 1 and the other end of the resistor R2 are connected.
As another preferable scheme, a solid-state relay is adopted in the control signal input port of the lower check valve and the control signal input port of the upper check valve.
As another preferred scheme, pin 23 of U1 of the present invention is connected to pin 2 of 521 opto-coupler U19 and one end of capacitor C102, the other end of capacitor C102 is connected to ground and pin 3 of U19, pin 1 of U19 is connected to 3.3V POWER supply through resistor R121, pin 4 of U19 is connected to one end of capacitor C104 and base of PNP triode Q6 through resistor R125, the other end of capacitor C104 is connected to ground and collector of PNP triode Q6, emitter of PNP triode Q6 is connected to anode of diode D18 and one end of control end of relay K5, cathode of diode D18 is connected to the other end of control end of relay K5, POWER supply end and fixed end of controlled switch of relay K5, first toggle end of controlled switch of relay K5 is connected to P-12V end, second toggle end of controlled switch of relay K5 is connected to control end of electromagnetic valve for preventing recharging, and the electromagnetic valve for preventing recharging is arranged between upper one-way valve and charging line.
The fuel gas recirculation system can be provided with an electromagnetic valve for preventing recirculation, the CPU monitors the action feedback output signal interruption time of the odorizing pump, no output signal exists in the set time, and the relay K5 can control the electromagnetic valve to be closed to prevent the fuel gas recirculation from occurring. When the output signal is transmitted again, the electromagnetic valve is immediately opened to continue outputting the odorizing agent.
In another preferred scheme, the pin 39 of the U1 is connected with the base of a PNP triode Q2 through a resistor R9, the emitter of the PNP triode Q2 is connected with a 5V power supply, the collector of the PNP triode Q2 is connected with the positive electrode of a buzzer, and the negative electrode of the buzzer is grounded.
Secondly, the liquid crystal display screen adopts an OCMJ4X8C liquid crystal display module.
In addition, the invention also comprises an RS232 part, wherein the RS232 part comprises an MAX3232C chip, pins 12 and 11 of the MAX3232C chip are respectively connected with pins 10 and 11 of the U1, a pin 16 of the MAX3232C chip is respectively connected with a 3.3V power supply, one end of a capacitor C3 and one end of a capacitor C2, the other end of the capacitor C3 is connected with a pin 2 of the MAX3232C chip, the other end of the capacitor C2 is respectively connected with one end of a capacitor C4, a ground wire and a pin 15 of the MAX3232C chip, and the other end of the capacitor C4 is connected with a pin 6 of the MAX3232C chip; a pin 8 of the MAX3232C chip is grounded through a reverse TVS diode D2, a pin 7 of the MAX3232C chip is grounded through a reverse TVS diode D4, a pin 13 of the MAX3232C chip is grounded through a reverse TVS diode D1, and a pin 14 of the MAX3232C chip is grounded through a reverse TVS diode D3; the 5 pin of the MAX3232C chip is connected with the 4 pin of the MAX3232C chip through a capacitor C6, and the 3 pin of the MAX3232C chip is connected with the 1 pin of the MAX3232C chip through a capacitor C5.
The invention has the beneficial effects.
The invention analyzes the working principle and the actual operation working condition of the existing equipment and the possible operation faults, and based on the basic principles of continuous odorization, uniform odorization, operation fault avoidance, unattended operation, low cost, stability and reliability required by LNG point supply, the invention carries out careful research on the aspects of signal butt joint of a control system and a gas flowmeter, the operation working condition of the control system, reasonable equipment precision and the like, carries out long-term in-factory simulation and actual operation tests, records the whole process of the operation working condition, monitors the odorization concentration at the tail end of a pipe network, and modifies the control mode and equipment configuration of the control system for many times, thereby achieving the requirement of LNG point supply.
The invention uses pulse signal to access stable, reliable and continuous odorization, has the function of compensation and avoiding the refilling of odorizing agent, is unattended, does not use an electromagnetic valve and has low cost.
The invention adopts the pulse signal to directly command the output of the odorizing pump, reduces the signal conversion process, can reliably odorize no matter how small or how long the gas flow is, and the odorizing is continuous and stable; the follow-up odorization is realized, the odorizing agent output quantity is changed along with the continuous change of the gas flow, and the odorizing agent concentration in unit gas is basically uniform.
The invention does not need to change the structure and the configuration of the prior equipment, and the manufacturing cost of the product is low.
The back part of the odorizing pipeline is provided with a check valve. The odor adding pipeline is provided with a check valve, so that the device is high-pressure resistant, durable in pressure maintaining, corrosion resistant and leak-free.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
Fig. 1 is a schematic view of the normal operation mode of the odorizing device.
FIG. 2 is a schematic view of the refilling route of the odorizing device.
Fig. 3 and 4 are graphs showing gas flow rate signals and the operating times of the odorizing pump.
Fig. 5 is a schematic circuit diagram of the power conversion part of the present invention.
FIG. 6 is a schematic diagram of the EEPROM circuit of the present invention.
Fig. 7 is a schematic diagram of a part of the RS232 circuit of the present invention.
Fig. 8 is a schematic circuit diagram of a drive control portion of the check valve of the present invention.
Fig. 9 is a control circuit diagram of the solenoid valve provided with backflow prevention according to the present invention.
FIG. 10 is a schematic diagram of a CPU detection control related circuit of the present invention.
Fig. 11 is a schematic circuit diagram of the USB interface portion of fig. 10.
Fig. 12 is a schematic circuit diagram of the key portion of fig. 10.
Fig. 13 is a schematic diagram of the CPU circuit of fig. 10.
Fig. 14 is a schematic circuit diagram of the clock circuit of fig. 10.
Fig. 15 is a schematic circuit diagram of the detection signal pulse input part and the odorizing pump drive control part in fig. 10.
Fig. 16 is a schematic circuit diagram of a portion of the liquid crystal display panel of fig. 10.
Fig. 17 is an automatic and manual control switching control circuit.
Fig. 18 is a pulse control power supply portion (U3 in fig. 18 is an LM2575 chip). The power conversion section of the present invention may also employ the circuit of fig. 18.
Fig. 19 is another embodiment of the check valve actuation control portion of the present invention.
Detailed Description
As shown in the figure, the present invention can be applied to an LNG point odorizing device, which includes a pulse time interval compensation controller (i.e., the natural gas point odorizing compensation monitoring device of the present invention), a gas flow meter, an odorizing agent storage tank, an odorizing pump, a lower check valve, an upper check valve, an odorizing pipeline, and a check valve, wherein a detection signal pulse input port of the pulse time interval compensation controller is connected to a detection signal pulse output port of the gas flow meter, and a control signal output port of the pulse time interval compensation controller is connected to a control signal input port of the odorizing pump;
the inlet of the odorizing pump is connected with the outlet of the odorizing agent storage tank through a lower one-way valve, the outlet of the odorizing pump is connected with the inlet of the odorizing pipeline through an upper one-way valve, and the outlet of the odorizing pipeline is connected with the gas pipeline through a check valve.
The odorizing pump pumps odorizing agent from the odorizing agent storage tank and outputs the odorizing agent to the upper one-way valve, the odorizing agent flows through the odorizing pipeline to the check valve and then enters the gas pipeline, and the odorizing agent is vaporized and mixed with the gas to enable the gas to have recognizable special smell, so that the gas supply safety is guaranteed.
The odorizing pump adopts an oil-filled electromagnetic diaphragm plunger metering pump.
The liquid level meter adopts a glass tube to calibrate the liquid level meter.
The detection signal pulse output port of the gas flowmeter is 0.1m 3 Or 1.0m 3 Or 2m 3 Or 5m 3 Or 10m 3 The flow outputs a pulse signal, and the pulse time interval compensation controller receives the pulse signal to control the odorizing pump to perform one or more actions. Each pulse follow-up signal can ensure that the odorizing pump has one or more actions, effectively outputs a certain amount of odorizing agent, reduces the signal conversion process, ensures the continuous output of the odorizing agent, and ensures that each time a certain amount of gas flows through, a certain proportion of odorizing agent is output to be mixed with the gasAnd (6) mixing.
The single output of the odorizing pump is 50mg, and one pulse signal represents 5m 3 The gas quantity, pulse time interval compensation controller receives a pulse signal to control the odorizing pump to output for 2 times.
The pulse time interval compensation controller receives a pulse signal to control the odorizing pump to output for 0.4 time, 0.8 time and 2 times. When the number of the pulses is less than 1 time, the pulse time interval compensation controller outputs 50mg of odorizing agent for 1 time when the pulse number is accumulated to be an integer; adjusting single output under the field working condition, when one pulse signal represents 2m & lt 3 & gt of gas flow, adjusting the single output to 80mg, and actuating the odorizing pump for 1 time at four pulses;
and (3) adjusting the unit gas odorizing standard under the on-site working condition, when one pulse signal represents 2m & lt 3 & gt gas flow, adjusting the odorizing standard to 25mg/m & lt 3 & gt, wherein the single output can still be 50mg, and the odorizing pump acts for 1 time when 2 pulses exist.
When the odorizing pump does not move for a long time (more than 30 minutes), the pulse time interval compensation controller controls the odorizing pump to increase the motion of the odorizing pump for several times, a little odorizing agent is output, the odorizing agent pushed back by the fuel gas is supplemented back again, and the fuel gas pushing back amount and the compensation output amount are kept equal; the compensation amount and the compensation times are determined according to the gas pipeline pressure and the tightness of the lower check valve and the upper check valve through field measurement, and the compensation amount and the compensation times are adjusted through tracking monitoring (by using the check valve with average mass, measured data of DN8 pipe diameter and 0.1MPa pressure are used, about 40 times of compensation are carried out in 24 hours, the volume of DN8 pipe diameter is about 50 grams per meter, single output is 50mg,40 times of output is 40 multiplied by 50=2000mg =2 grams, and the length is about 4 centimeters. Therefore, the pulse time interval compensation controller has the functions of preventing the gas from recharging, compensating and odorizing under the working condition of no gas flow for a long time. The automatic closing of the valve on the odorizing pipeline by using the electromagnetic valve can achieve the effect of cutting off the gas recirculation phenomenon, but parts such as the electromagnetic valve, the tee joint, the bypass pipe, the bypass valve, the cable and the like need to be added, and the cutting-off valves used for maintenance need to be arranged in front of and behind the electromagnetic valve. The cost is high, and the low-cost LNG point supply odorizing equipment is not suitable.
The pulse time interval compensation controller comprises a manual time interval unit control mode and an automatic follow-up control mode, if the automatic follow-up control mode has a problem, the manual time interval unit control mode is started, a 1K monitoring resistor R14 is added to the circuit design, see a circuit schematic diagram 17, when the pulse input signal end has a problem, a DC 24V load output by the controller changes, the monitoring resistor R14 sends a change signal to a software program, and the software automatically jumps to be switched to the manual time interval control mode. When the problem of the pulse input signal end is solved, the DC 24V load output by the controller automatically recovers to be normal, and the software automatically jumps to be switched to an automatic follow-up control mode.
The manual time interval unit control mode divides one day (24 hours) into 48 time interval units, one unit is set every 30 minutes, 0-255 times of output times are set in each time interval unit, and the output times are evenly distributed to each minute; outputting the signal once every two minutes (or three or more minutes) when the time per minute is less than 1, and so on; when only 1 output is set, the unit outputs in the first minute of the time interval, and no output exists in the rest minutes.
Problems occurring in the automatic follow-up control mode include gas flowmeter failure, gas flowmeter overhaul and gas flowmeter communication interruption.
The pulse time interval compensation controller is arranged in the closed explosion-proof box body; is suitable for long-term unattended continuous operation outside the inner chamber of the explosion-proof area.
The whole electric circuit adopts a low-power consumption and low-heat-generation design, and does not need to be externally provided with a heat dissipation device, electronic elements of the power supply part in the figure 5 are all low-power consumption elements, the circuit of the power supply part is designed into a low-power consumption switch adjusting circuit, and basically no heat source is generated during operation, so that the external heat dissipation device is not needed.
The pulse period compensation controller comprises a short-circuit protection and alarm circuit;
the power supply of the pulse time interval compensation controller adopts an external AC220V +/-20% power supply, and the pulse time interval compensation controller is provided with a direct-current power supply output port capable of outputting 24V direct-current power supply to the outside to supply power to the gas flowmeter;
the pulse time interval compensation controller is provided with a 0-300V pulse signal output port and controls the odorizing pump to output for 0-50 times/minute, the pulse signal width is 200ms, the peak value is 300V +/-20V, and the low peak value is 0V.
The pulse time interval compensation controller is provided with a liquid crystal display screen, and the liquid crystal display screen displays the accumulated odorizing amount (unit g), the accumulated time (year, month, day, hour, minute and second), the single odorizing amount (unit mg) and the natural clock date; the automatic follow-up control mode displays the accumulated gas flow.
The pulse period compensation controller automatically stores the operation data once per hour, and the storage content comprises storage time and accumulated odorizing amount; the running data storage amount is more than 35 days, the stored data is manually cleared and accumulated again, and the new running data automatically covers and updates to replace the old data in the previous period when the clearing operation is not performed.
The pulse time interval compensation controller is provided with a data communication interface and a USB interface for operating data output, and the data communication interface adopts an RS485 modbus communication protocol; and (3) adopting MODSCON test software to set the running parameters of the pulse time interval compensation controller by the computer notebook or the pad, and reading the running historical data of the controller.
The pulse time interval compensation controller automatically stores the operation data when the power is off or suddenly cut off, and the original operation mode and the set operation parameters are not changed when the power is on or restored. The CPU has EEPROM function, when the running state is changed, the running state is automatically stored in EEPROM, when the power is off or cut off suddenly, the data is stored in EEPROM, when the power is on again or power is restored, the data is read out from EEPROM and automatically runs according to the stored data. Ensuring the synchronization of air supply and odorization and the investigation and evidence collection of accident analysis.
The conversion relation between the single output of the odorizing pump and the gas flow is as follows: q × S = D × F × 60
Unit amount of odorant added in gas, S-odorant standard: mg/m 3 ；
Single output of odorizing pump, D-single output: mg/time;
maximum operating frequency of the odorizing pump, F-maximum operating frequency: dividing/dividing;
maximum hourly flow of gas: q-maximum gas flow: m is a unit of 3 /h；
The highest working frequency of the odorizing pump is set through the keys.
The pulse time interval compensation controller calculates the output times of the odorizing pump according to the gas flow change and the odorizing standard. If the parameter setting is wrong or exceeds the limit, the pulse period compensation controller gives an alarm to prompt that the parameter setting is wrong.
As another preferred scheme, the protocol of the present invention is as follows:
the pulse time interval compensation controller comprises a CPU, an EEPROM, an RS485 part, a power supply conversion part, a USB interface part, a clock circuit, a detection signal pulse input part, a one-way valve drive control part, an odorizing pump drive control part, a key part and a liquid crystal display screen, wherein a signal transmission port of the CPU is respectively connected with a signal transmission port of the EEPROM, a signal transmission port of the RS485 part, a signal transmission port of the USB interface part and a signal transmission port of the clock circuit;
the CPU operation parameter setting input port is connected with the key part;
the control signal output port of the CPU is respectively connected with the control signal input port of the one-way valve drive control part and the control signal input port of the odorizing pump drive control part, the control signal output port of the one-way valve drive control part is respectively connected with the control signal input port of the lower one-way valve and the control signal input port of the upper one-way valve, and the control signal output port of the odorizing pump drive control part is connected with the control signal input port of the odorizing pump;
the power supply port of the CPU is connected with the power supply output port of the power supply conversion part.
The data output interface can be connected with the 485 communication port, and accumulated odorizing amount and operation data are remotely transmitted.
The pulse time interval compensation controller receives the pulse gas flow signal to control the odorizing pump to output odorizing agent according to the set output quantity.
The pulse period compensation controller accumulates and stores the operating data, and the operating data can be stored in an external USB flash disk through the USB interface part.
The key part can be used for setting system time, local station address, single dosing, mixing ratio, pulse follow-up flow, dosing frequency,
The CPU adopts an STC12C5A60S2 chip U1, a TPL521 optocoupler U2 is adopted for a detection signal pulse input part, a pin 1 of the U2 is connected with a 24V power supply, a pin 2 of the U2 is connected with a detection signal pulse output port of the gas flowmeter through a resistor R6, a pin 3 of the U2 is grounded, and a pin 4 of the U2 is connected with a pin 12 of the U1.
The drive control part of the odorizing pump adopts a TPL521 opto-coupler U3, a pin 1 of the U3 is connected with a 5V power supply, a pin 2 of the U3 is connected with a pin 34 of the U1 through a resistor R7, and a pin 4 and a pin 3 of the U3 are connected with a control signal input port of the odorizing pump.
The one-way valve drive control part comprises a TPL521 optocoupler U7 and a TPL521 optocoupler U13, wherein a pin 1 of the U7 is connected with a 3.3V power supply through a resistor R40, a pin 2 of the U7 is respectively connected with one end of a resistor R41, one end of a capacitor C35 and a pin 21 of the U1, the other end of the capacitor C35 is grounded, the other end of the resistor R41 is respectively connected with a pin 3 of the U7, one end of a resistor R43 and one end of a resistor R42, a pin 4 of the U7 is connected with a P-12V end, the other end of the resistor R43 is respectively connected with one end of a capacitor C39 and a base of an NPN triode Q2, the other end of the capacitor C39 is respectively connected with the other end of the resistor R42, an emitter of the NPN triode Q2 and a ground wire, a collector of the NPN triode Q2 is respectively connected with one end of the resistor R44 and a control signal input port of the lower one-way valve, and the other end of the resistor R44 is connected with a P-12V end through an LED lamp D9;
a pin 1 of the U13 is connected with a 3.3V power supply through a resistor R74, a pin 2 of the U13 is respectively connected with one end of a resistor R77, one end of a capacitor C79 and a pin 22 of the U1, the other end of the capacitor C79 is grounded, the other end of the resistor R77 is respectively connected with a pin 3 of the U13, one end of a resistor R83 and one end of a resistor R80, a pin 4 of the U13 is connected with a P-12V end, the other end of the resistor R83 is respectively connected with one end of a capacitor C81 and a base electrode of an NPN triode Q3, the other end of the capacitor C81 is respectively connected with the other end of the resistor R80, an emitting electrode of the NPN triode Q3 and a ground wire, a collector electrode of the NPN triode Q3 is respectively connected with one end of the resistor R86 and a control signal input port of the upper one-way valve, and the other end of the resistor R86 is connected with a P-12V end through an LED lamp 15.
The EEPROM comprises a 24C02 chip, pins 1, 2, 3 and 4 of the 24C02 chip are grounded, pin 5 of the 24C02 chip is respectively connected with one end of a resistor R2 and a CPU signal transmission port, pin 6 of the 24C02 chip is connected with a 3.3V power supply through a resistor R1, the other end of the resistor R2 is respectively connected with the 3.3V power supply, pin 8 of the 24C02 chip and one end of a capacitor C1, and the other end of the capacitor C1 is grounded.
The RS485 part comprises a MAX485E chip U5, wherein 1 pin of U5 is connected with 10 pins of U1, 2 pins of U5 are respectively connected with 3 pins of U5 and 14 pins of U1, 4 pins of U5 are connected with 11 pins of U1, 5 pins of U5 are grounded, 6 pins of U5 are respectively connected with one end of a resistor R14 and an A port of a transmission interface J7, the other end of the resistor R14 is respectively connected with a B port of the transmission interface J7 and 7 pins of U5, and 8 pins of U5 are connected with a 5V power supply.
The power supply conversion part comprises an LM2596 chip U9 and an LM1117 chip U10, wherein a pin 1 of the U9 is respectively connected with a cathode of a diode D12, a 12V power supply end, an anode of a capacitor C44 and one end of a capacitor C46, an anode of the diode D12 is connected with an output end of a switching power supply, and an input end of the switching power supply is connected with a mains supply; the negative electrode of a capacitor C44, the other end of the capacitor C46, a pin 5 of a U9 and a pin 3 of the U9 are grounded, a pin 2 of the U9 is respectively connected with a cathode of a Schottky diode D13 and one end of an inductor L5, an anode of the Schottky diode D13 is grounded, the other end of the inductor L5 is respectively connected with a positive electrode of a capacitor C50, a pin 4 of the U9, a 5V power supply end, one end of a capacitor C52 and a pin 3 of the U10, and the negative electrode of the capacitor C50, the other end of the capacitor C52 and a pin 1 of the U10 are grounded; u10's 2 feet link to each other with electric capacity C53 one end, inductance L6 one end respectively, and the electric capacity C53 other end ground connection, and the inductance L6 other end links to each other with 3.3V power end, electric capacity C55 one end, resistance R46 one end respectively, and the electric capacity C55 other end ground connection, and the resistance R46 other end passes through LED lamp D14 ground connection.
The USB interface part comprises a HEADER 14X2USB chip, wherein a pin 2 of the USB chip is connected with a 3V3 power supply through a 0.47 mu F capacitor, a pin 5 of the USB chip is connected with a pin 3 of the U1, a pin 6 of the USB chip is respectively connected with a pin 4 of the U1 and the 3V3 power supply, a pin 9 of the USB chip is respectively connected with one end of a 10nF capacitor and a pin 11 of the USB chip, and the other end of the 10nF capacitor is grounded; the 13 feet of USB chip link to each other with 12M crystal oscillator one end, first 22pF electric capacity one end respectively, and first 22pF electric capacity other end ground connection, the 12M crystal oscillator other end links to each other with the 14 feet of second 22pF electric capacity one end, USB chip respectively, and second 22pF electric capacity other end ground connection, 24 feet of USB chip loop through reverse emitting diode, 1K resistance connects 3V3 power.
The clock circuit comprises a 1302 chip U4, pins 2 and 3 of the U4 are connected with two ends of a 32K768 crystal oscillator, a pin 5 of the U4 is respectively connected with one end of a resistor R12 and a pin 38 of the U1, the other end of the resistor R12 is connected with a 5V power supply, a pin 6 of the U4 is respectively connected with one end of a resistor R11 and a pin 37 of the U1, the other end of the resistor R11 is connected with the 5V power supply, a pin 7 of the U4 is respectively connected with one end of a resistor R10 and a pin 36 of the U1, and the other end of the resistor R10 is connected with the 5V power supply; the pin 8 of U4 is connected with the battery.
The key part comprises a KEYLEFT key, a KEYUP key, a KEYDOWN key, a KEYSET key, a KEYRIGHT key and a KEYCHANGE key, wherein one connection point of the KEYLEFT key is respectively connected with one end of the resistor R2 and the pin 2 of the U1, and the other connection point of the KEYLEFT key is grounded;
one connection point of the KEYUP button is respectively connected with one end of the resistor R3 and the 5 feet of the U1, and the other connection point of the KEYUP button is grounded;
one connection point of the KEYDOWN key is respectively connected with one end of the resistor R4 and the 7 pins of the U1, and the other connection point of the KEYDOWN key is grounded;
one connection point of the KEYSET key is respectively connected with one end of the resistor R5 and the pin 6 of the U1, and the other connection point of the KEYSET key is grounded;
one connection point of the KEYRIGHT key is respectively connected with one end of the resistor R1 and the pin 8 of the U1, and the other connection point of the KEYRIGHT key is grounded;
one connection point of the KEYCHANGE key is respectively connected with one end of the resistor R2 and the pin 1 of the U1, and the other connection point of the KEYCHANGE key is grounded;
the other end of the resistor R2, the other end of the resistor R3, the other end of the resistor R4, the other end of the resistor R5, the other end of the resistor 1 and the other end of the resistor R2 are connected.
And the control signal input port of the lower check valve and the control signal input port of the upper check valve adopt solid relays.
The 23 feet of the U1 are respectively connected with the 2 feet of the 521 optocoupler U19 and one end of a capacitor C102, the other end of the capacitor C102 is respectively connected with a ground wire and the 3 feet of the U19, the 1 foot of the U19 is connected with a 3.3V POWER supply through a resistor R121, the 4 feet of the U19 are respectively connected with one end of a capacitor C104 and a base of a PNP triode Q6 through a resistor R125, the other end of the capacitor C104 is respectively connected with the ground wire and a collector of the PNP triode Q6, an emitter of the PNP triode Q6 is respectively connected with an anode of a diode D18 and one end of a control end of a relay K5, a cathode of the diode D18 is respectively connected with the other end of the control end of the relay K5, a POWER end and a fixed end of a controlled switch of the relay K5, a first toggle end of the controlled switch of the relay K5 is connected with a P-12V end, a second toggle end of the controlled switch of the relay K5 is connected with a control end of an anti-recharge electromagnetic valve, and the anti-recharge electromagnetic valve is arranged between an upper one-way valve and an odorizing pipeline. The device can be provided with an electromagnetic valve for preventing the gas from being refilled, the CPU monitors the action feedback output signal interruption time of the odorizing pump, no output signal is generated within the set time, and the relay K5 can control the electromagnetic valve to be closed to prevent the gas from being refilled. When the output signal is transmitted again, the electromagnetic valve is immediately opened to continue outputting the odorizing agent.
The 39 feet of the U1 are connected with the base electrode of a PNP triode Q2 through a resistor R9, the emitting electrode of the PNP triode Q2 is connected with a 5V power supply, the collecting electrode of the PNP triode Q2 is connected with the positive electrode of a buzzer, and the negative electrode of the buzzer is grounded. And the buzzer gives a fault alarm.
The liquid crystal display screen adopts an OCMJ4X8C liquid crystal display module.
The invention also comprises an RS232 part, wherein the RS232 part comprises an MAX3232C chip, pins 12 and 11 of the MAX3232C chip are respectively connected with pins 10 and 11 of the U1, a pin 16 of the MAX3232C chip is respectively connected with a 3.3V power supply, one end of a capacitor C3 and one end of a capacitor C2, the other end of the capacitor C3 is connected with a pin 2 of the MAX3232C chip, the other end of the capacitor C2 is respectively connected with one end of a capacitor C4, a ground wire and a pin 15 of the MAX3232C chip, and the other end of the capacitor C4 is connected with a pin 6 of the MAX3232C chip; a pin 8 of the MAX3232C chip is grounded through a reverse TVS diode D2, a pin 7 of the MAX3232C chip is grounded through a reverse TVS diode D4, a pin 13 of the MAX3232C chip is grounded through a reverse TVS diode D1, and a pin 14 of the MAX3232C chip is grounded through a reverse TVS diode D3; the 5 pin of the MAX3232C chip is connected with the 4 pin of the MAX3232C chip through a capacitor C6, and the 3 pin of the MAX3232C chip is connected with the 1 pin of the MAX3232C chip through a capacitor C5.
It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, not limitation, and it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (5)
1. The natural gas point supplies to add smelly compensation monitoring device, including CPU, EEPROM, RS485 part, power conversion part, USB interface part, clock circuit, detection signal pulse input part, check valve drive control part, add smelly pump drive control part, button part and liquid crystal display, its characterized in that: a signal transmission port of the CPU is respectively connected with a signal transmission port of the EEPROM, a signal transmission port of the RS485 part, a signal transmission port of the USB interface part and a signal transmission port of the clock circuit, a detection signal input port of the CPU is connected with a detection signal output port of a detection signal pulse input part, and a detection signal input port of the detection signal pulse input part is connected with a detection signal pulse output port of the gas flowmeter;
the CPU operation parameter setting input port is connected with the key part;
the control signal output port of the CPU is respectively connected with the control signal input port of the one-way valve drive control part and the control signal input port of the odorizing pump drive control part, the control signal output port of the one-way valve drive control part is respectively connected with the control signal input port of the lower one-way valve and the control signal input port of the upper one-way valve, and the control signal output port of the odorizing pump drive control part is connected with the control signal input port of the odorizing pump;
the power supply port of the CPU is connected with the power supply output port of the power supply conversion part;
the detection signal pulse input part adopts a TPL521 opto-coupler U2, a pin 1 of the U2 is connected with a 24V power supply, a pin 2 of the U2 is connected with a detection signal pulse output port of the gas flowmeter through a resistor R6, a pin 3 of the U2 is grounded, and a pin 4 of the U2 is connected with a pin 12 of the U1;
the driving control part of the odorizing pump adopts a TPL521 opto-coupler U3, a pin 1 of the U3 is connected with a 5V power supply, a pin 2 of the U3 is connected with a pin 34 of the U1 through a resistor R7, and a pin 4 and a pin 3 of the U3 are connected with a control signal input port of the odorizing pump;
the one-way valve drive control part comprises a TPL521 optocoupler U7 and a TPL521 optocoupler U13, wherein a pin 1 of the U7 is connected with a 3.3V power supply through a resistor R40, a pin 2 of the U7 is respectively connected with one end of a resistor R41, one end of a capacitor C35 and a pin 21 of the U1, the other end of the capacitor C35 is grounded, the other end of the resistor R41 is respectively connected with a pin 3 of the U7, one end of a resistor R43 and one end of a resistor R42, a pin 4 of the U7 is connected with a P-12V end, the other end of the resistor R43 is respectively connected with one end of a capacitor C39 and a base electrode of an NPN triode Q2, the other end of the capacitor C39 is respectively connected with the other end of the resistor R42, an emitting electrode of the NPN triode Q2 and a ground wire, a collector electrode of the NPN triode Q2 is respectively connected with one end of the resistor R44 and a control signal input port of a lower one-way valve, and the other end of the resistor R44 is connected with a P-12V end through an LED lamp D9;
a pin 1 of the U13 is connected with a 3.3V power supply through a resistor R74, a pin 2 of the U13 is respectively connected with one end of a resistor R77, one end of a capacitor C79 and a pin 22 of the U1, the other end of the capacitor C79 is grounded, the other end of the resistor R77 is respectively connected with a pin 3 of the U13, one end of a resistor R83 and one end of a resistor R80, a pin 4 of the U13 is connected with a P-12V end, the other end of the resistor R83 is respectively connected with one end of a capacitor C81 and a base electrode of an NPN triode Q3, the other end of the capacitor C81 is respectively connected with the other end of the resistor R80, an emitting electrode of the NPN triode Q3 and a ground wire, a collector electrode of the NPN triode Q3 is respectively connected with one end of the resistor R86 and a control signal input port of the upper one-way valve, and the other end of the resistor R86 is connected with a P-12V end through an LED lamp 15;
the power supply conversion part comprises an LM2596 chip U9 and an LM1117 chip U10, wherein a pin 1 of the U9 is respectively connected with a cathode of a diode D12, a 12V power supply end, an anode of a capacitor C44 and one end of a capacitor C46, an anode of the diode D12 is connected with an output end of a switching power supply, and an input end of the switching power supply is connected with a mains supply; the negative electrode of a capacitor C44, the other end of the capacitor C46, the pin 5 of the U9 and the pin 3 of the U9 are grounded, the pin 2 of the U9 is respectively connected with the cathode of a Schottky diode D13 and one end of an inductor L5, the anode of the Schottky diode D13 is grounded, the other end of the inductor L5 is respectively connected with the positive electrode of a capacitor C50, the pin 4 of the U9, a power supply end of 5V, one end of a capacitor C52 and the pin 3 of the U10, and the negative electrode of the capacitor C50, the other end of the capacitor C52 and the pin 1 of the U10 are grounded; a pin 2 of the U10 is respectively connected with one end of a capacitor C53 and one end of an inductor L6, the other end of the capacitor C53 is grounded, the other end of the inductor L6 is respectively connected with a 3.3V power supply end, one end of a capacitor C55 and one end of a resistor R46, the other end of the capacitor C55 is grounded, and the other end of the resistor R46 is grounded through an LED lamp D14;
the clock circuit comprises a 1302 chip U4, pins 2 and 3 of the U4 are connected with two ends of a 32K768 crystal oscillator, pins 5 of the U4 are respectively connected with one end of a resistor R12 and a pin 38 of the U1, the other end of the resistor R12 is connected with a 5V power supply, pins 6 of the U4 are respectively connected with one end of a resistor R11 and a pin 37 of the U1, the other end of the resistor R11 is connected with the 5V power supply, pins 7 of the U4 are respectively connected with one end of a resistor R10 and a pin 36 of the U1, and the other end of the resistor R10 is connected with the 5V power supply; the pin 8 of U4 is connected with the battery.
2. The device for compensating and monitoring odorization of a natural gas point supply according to claim 1, wherein the CPU employs an STC12C5a60S2 chip U1.
3. The natural gas point supply odorization compensation monitoring device according to claim 1, characterized in that the EEPROM includes a 24C02 chip, pins 1, 2, 3, 4 of the 24C02 chip are grounded, pins 5 of the 24C02 chip are respectively connected with one end of a resistor R2 and a CPU signal transmission port, pin 6 of the 24C02 chip is connected with a 3.3V power supply through a resistor R1, the other end of the resistor R2 is respectively connected with the 3.3V power supply, pin 8 of the 24C02 chip and one end of a capacitor C1, and the other end of the capacitor C1 is grounded.
4. The device for compensating and monitoring the odorization of the natural gas point supply according to claim 2, wherein the RS485 part comprises a MAX485E chip U5, wherein a pin 1 of the U5 is connected with a pin 10 of the U1, a pin 2 of the U5 is respectively connected with a pin 3 of the U5 and a pin 14 of the U1, a pin 4 of the U5 is connected with a pin 11 of the U1, a pin 5 of the U5 is grounded, a pin 6 of the U5 is respectively connected with one end of a resistor R14 and an port A of a transmission interface J7, the other end of the resistor R14 is respectively connected with a port B of the transmission interface J7 and a pin 7 of the U5, and a pin 8 of the U5 is connected with a 5V power supply.
5. The natural gas point-supply odorization compensation monitoring device of claim 2, wherein the USB interface portion includes a HEADER 14X2USB chip, 2 pins of the USB chip are connected to a 3V3 power supply through a 0.47 μ F capacitor, 5 pins of the USB chip are connected to 3 pins of the U1, 6 pins of the USB chip are connected to 4 pins of the U1 and the 3V3 power supply respectively, 9 pins of the USB chip are connected to one end of a 10nF capacitor and 11 pins of the USB chip respectively, and the other end of the 10nF capacitor is grounded; the 13 feet of USB chip link to each other with 12M crystal oscillator one end, first 22pF electric capacity one end respectively, and first 22pF electric capacity other end ground connection, the 12M crystal oscillator other end links to each other with the 14 feet of second 22pF electric capacity one end, USB chip respectively, and second 22pF electric capacity other end ground connection, 24 feet of USB chip loop through reverse emitting diode, 1K resistance connects 3V3 power.
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| CA2637999A1 (en) * | 2007-07-16 | 2009-01-16 | Boss Packaging Inc. | Pipeline additive control device and method |
| GB0823171D0 (en) * | 2008-12-18 | 2009-01-28 | Bp Exploration Operating | Fluid transmission control system and method |
| CN201636530U (en) * | 2009-12-14 | 2010-11-17 | 沈阳贝尔燃气有限公司 | Automatic fuel gas odorizing device |
| CN202532185U (en) * | 2012-03-20 | 2012-11-14 | 天津道法科技有限公司 | Natural gas odorization control device |
| CN207112375U (en) * | 2017-07-28 | 2018-03-16 | 沈阳光正工业有限公司 | Natural gas point is for adding smelly compensation supervising device |
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2017
- 2017-07-28 CN CN201710630703.6A patent/CN107314248B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591462A (en) * | 2013-11-15 | 2014-02-19 | 乐山倍创机械制造有限公司 | Fuel gas odorization device |
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